multiple time recalculate SVPullToRefreshView layout

[sreshetnyak]

• (void)layoutForVertical
• (void)layoutForHorizontal

this methods call everytime when change contentSize (when we scroll), it kill performance when calculate label size and set text to title or subtitle label.

• (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if([keyPath isEqualToString:@"contentOffset"]) [self scrollViewDidScroll:[[change valueForKey:NSKeyValueChangeNewKey] CGPointValue]]; else if([keyPath isEqualToString:@"contentSize"]) { [self layoutSubviews];

    self.frame = [SVPullToRefreshView rectForRefreshViewAtPosition:self.position scrollView:self.scrollView];
  

  } else if([keyPath isEqualToString:@"frame"]) [self layoutSubviews];

}